:root {
  --bg: #f6f3ee;
  --surface: #fffdf8;
  --surface-strong: #ffffff;
  --text: #1f2933;
  --muted: #64707d;
  --line: rgba(31, 41, 51, 0.12);
  --accent: #1d4ed8;
  --accent-strong: #143b9f;
  --accent-soft: rgba(29, 78, 216, 0.10);
  --shadow: 0 24px 70px rgba(31, 41, 51, 0.10);
  --radius-large: 28px;
  --radius-medium: 18px;
  --max-width: 1120px;
}

body.dark {
  --bg: #101418;
  --surface: #171d23;
  --surface-strong: #1f2730;
  --text: #eef2f6;
  --muted: #a8b3bd;
  --line: rgba(238, 242, 246, 0.12);
  --accent: #8bb7ff;
  --accent-strong: #c7dcff;
  --accent-soft: rgba(139, 183, 255, 0.14);
  --shadow: 0 24px 70px rgba(0, 0, 0, 0.28);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: "Inter", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

body.theme-transition-active,
body.theme-transition-active .site-header,
body.theme-transition-active .theme-toggle,
body.theme-transition-active .button,
body.theme-transition-active .profile-card,
body.theme-transition-active .content-card,
body.theme-transition-active .interest-card,
body.theme-transition-active .publication-card,
body.theme-transition-active .link-card,
body.theme-transition-active .brand-mark {
  transition:
    background-color 260ms ease,
    color 260ms ease,
    border-color 260ms ease,
    box-shadow 260ms ease,
    background 260ms ease;
}

body.theme-transition-active .theme-icon {
  transition: opacity 180ms ease;
}

:focus-visible {
  outline: 3px solid color-mix(in srgb, var(--accent) 70%, white);
  outline-offset: 3px;
}

a {
  color: inherit;
  text-decoration: none;
}

.page-shell {
  width: min(100% - 32px, var(--max-width));
  margin: 0 auto;
}

.site-header {
  position: sticky;
  top: 16px;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin: 16px 0 56px;
  padding: 14px 16px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: color-mix(in srgb, var(--surface) 86%, transparent);
  backdrop-filter: blur(18px);
  box-shadow: 0 12px 34px rgba(0, 0, 0, 0.06);
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-weight: 800;
  letter-spacing: -0.03em;
}

.brand-text {
  padding-left: 8px;
  white-space: nowrap;
}

.main-nav {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 22px;
  color: var(--muted);
  font-size: 0.94rem;
  font-weight: 600;
}

.main-nav a {
  transition: color 180ms ease;
}

.main-nav a:hover,
.main-nav a.active {
  color: var(--text);
}

.theme-toggle {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 50%;
  background: var(--surface-strong);
  color: var(--text);
  cursor: pointer;
  transition: transform 180ms ease, border-color 180ms ease, background-color 180ms ease;
}

.theme-toggle:hover {
  transform: translateY(-1px);
}

.theme-icon {
  font-size: 1rem;
  line-height: 1;
}

.hero {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, 0.65fr);
  gap: 40px;
  align-items: center;
  min-height: 560px;
}

.eyebrow,
.section-kicker {
  margin: 0 0 14px;
  color: var(--accent);
  font-size: 0.8rem;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

h1,
h2,
h3 {
  line-height: 1.08;
}

h1 {
  max-width: 850px;
  margin: 0;
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(3.2rem, 8vw, 6.6rem);
  font-weight: 700;
  letter-spacing: -0.07em;
}

.hero-subtitle {
  max-width: 780px;
  margin: 26px 0 0;
  color: var(--muted);
  font-size: clamp(1.06rem, 2vw, 1.24rem);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 46px;
  padding: 0 18px;
  border-radius: 999px;
  font-weight: 700;
  transition: transform 180ms ease, background 180ms ease, border-color 180ms ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button.primary {
  background: var(--accent);
  color: white;
}

.button.secondary {
  border: 1px solid var(--line);
  background: var(--surface);
  color: var(--text);
}

.button-email {
  gap: 10px;
}

.button-email span[aria-hidden="true"] {
  font-size: 1rem;
}

.profile-card {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-large);
  background: var(--surface);
  box-shadow: var(--shadow);
}

.photo-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 4 / 5;
  border-radius: 22px;
  background:
    linear-gradient(135deg, var(--accent-soft), transparent),
    var(--surface-strong);
}

.profile-photo,
.photo-fallback {
  width: 100%;
  height: 100%;
}

.profile-photo {
  display: block;
  object-fit: cover;
}

.photo-fallback {
  display: none;
  place-items: center;
  color: var(--accent);
  font-family: "Source Serif 4", Georgia, serif;
  font-size: 5rem;
  font-weight: 700;
  letter-spacing: -0.08em;
}

.profile-info {
  padding: 20px 4px 4px;
}

.profile-info h2 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.profile-info p {
  margin: 0;
  color: var(--muted);
}

.section {
  padding: 72px 0;
}

.section-heading {
  display: grid;
  grid-template-columns: 0.65fr 1.35fr;
  gap: 32px;
  align-items: end;
  margin-bottom: 24px;
}

.section-heading h2 {
  margin: 0;
  font-family: "Source Serif 4", Georgia, serif;
  font-size: clamp(2rem, 4vw, 3.4rem);
  letter-spacing: -0.05em;
}

.content-card,
.interest-card,
.publication-card,
.link-card {
  border: 1px solid var(--line);
  background: var(--surface);
  box-shadow: 0 14px 50px rgba(31, 41, 51, 0.06);
}

.content-card {
  max-width: 820px;
  margin-left: auto;
  padding: 34px;
  border-radius: var(--radius-large);
}

.content-card p {
  margin: 0;
  color: var(--muted);
  font-size: 1.04rem;
}

.content-card p + p {
  margin-top: 18px;
}

.interest-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 16px;
}

.interest-card {
  padding: 24px;
  border-radius: var(--radius-medium);
}

.interest-card h3 {
  margin: 0 0 10px;
  font-size: 1.05rem;
}

.interest-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.publication-list {
  display: grid;
  gap: 14px;
}

.publication-card {
  display: grid;
  grid-template-columns: 120px 1fr;
  gap: 22px;
  padding: 24px;
  border-radius: var(--radius-medium);
}

.publication-meta {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: flex-start;
  gap: 10px;
  text-align: center;
}

.publication-card h3 {
  margin: 0;
  font-size: 1.08rem;
}

.publication-type {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  max-width: 100%;
  padding: 4px 10px;
  border: 1px solid color-mix(in srgb, var(--accent) 22%, var(--line));
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.69rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  line-height: 1.1;
  white-space: nowrap;
  text-transform: uppercase;
}

.publication-card a {
  display: inline-block;
  margin-top: 10px;
  color: var(--accent);
  font-weight: 800;
}

.publication-year {
  color: var(--accent);
  font-weight: 800;
}

.venue {
  margin: 8px 0 0;
  color: var(--muted);
}

.links-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 14px;
}

.link-card {
  display: flex;
  flex-direction: column;
  min-height: 132px;
  padding: 20px;
  border-radius: var(--radius-medium);
  transition: transform 180ms ease, border-color 180ms ease;
}

.link-card:hover {
  transform: translateY(-3px);
  border-color: color-mix(in srgb, var(--accent) 42%, var(--line));
}

.link-card span {
  margin-bottom: 8px;
  font-weight: 800;
}

.link-card small {
  color: var(--muted);
}

@media (max-width: 900px) {
  .site-header {
    flex-wrap: wrap;
    align-items: center;
    border-radius: 24px;
    gap: 14px 18px;
  }

  .main-nav {
    order: 3;
    width: 100%;
    justify-content: flex-start;
    flex-wrap: wrap;
    gap: 12px 18px;
    font-size: 0.9rem;
  }

  .hero {
    grid-template-columns: 1fr;
    min-height: auto;
  }

  .profile-card {
    max-width: 420px;
  }

  .section-heading {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .content-card {
    margin-left: 0;
  }

  .interest-grid,
  .links-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .page-shell {
    width: min(100% - 22px, var(--max-width));
  }

  .site-header {
    margin-bottom: 34px;
    padding: 14px;
  }

  .brand-text {
    display: block;
    padding-left: 4px;
    font-size: 0.96rem;
  }

  .main-nav {
    gap: 10px 14px;
    font-size: 0.86rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .button {
    width: 100%;
  }

  .content-card,
  .interest-card,
  .publication-card,
  .link-card {
    padding: 20px;
  }

  .publication-card {
    grid-template-columns: 1fr;
    gap: 8px;
  }

  .interest-grid,
  .links-grid {
    grid-template-columns: 1fr;
  }
}